Silicon steel sheet structure and high-speed motor rotor

Abstract

The utility model discloses a silicon steel sheet structure and a high-speed motor rotor, and relates to the field of motor magnetic circuit parts, the silicon steel sheet structure comprises magnetic tile matching positions and magnetic tile fitting sections, the arc surface of a silicon steel sheet is provided with at least four magnetic tile matching positions, the spacing radians of the adjacent magnetic tile matching positions are the same, and the root parts of the magnetic tile matching positions are provided with grooves. The arc surface of the silicon steel sheet is a magnetic shoe attaching section. Compared with the prior art that the installation volume of the magnetic shoe is limited by an iron core, the height of the silicon steel sheet can be larger than the height of the matching position of the magnetic shoe, so that the magnetic field intensity of the magnetic shoe is higher, and the magnetic density is higher. And after the silicon steel sheets are enveloped with the magnetic shoes, air gaps are eliminated, vibration between the magnetic shoes and the silicon steel sheets is avoided, the magnetic density is high, the power is high, the overall strength is high, and the running state is good under the condition of high rotating speed. And the higher the rotating speed of the motor is, the more saved the manufacturing materials are, the lower the cost is, and the large-scale production of the motor is facilitated. The silicon steel sheet is especially suitable for a motor rotor of a high-speed motor.

Description

Technical Field

[0001] This utility model relates to the field of magnetic circuit components for motors, specifically to silicon steel sheet structures for rotating components of magnetic circuits and high-speed motor rotors. Background Technology

[0002] The air gap size of a brushless motor has a significant impact on its performance, mainly in the following aspects: Dynamic response performance: The smaller the air gap, the greater the electromagnetic force between the stator and rotor, resulting in better dynamic response performance, higher control precision, and higher reliability. Efficiency: The smaller the air gap, the less power is required to rotate the rotor, leading to higher motor efficiency. This is because a smaller air gap reduces power loss. Output torque: The smaller the air gap, the greater the output torque of the motor. Torque is determined by the electromagnetic force, which increases as the air gap decreases. Power factor: A smaller air gap reduces the excitation current, thus increasing the power factor.

[0003] Existing internal rotor brushless motors are divided into two structural types: those with embedded magnets and those with surface-mount magnets. The embedded magnet structure has the magnets installed inside the rotor laminations, offering high stability and usability in high-speed environments (10,000-40,000 RPM). However, some magnetic fields are shielded by the iron core, resulting in a relatively large air gap and consequently, low air gap magnetic flux density and power density. The surface-mount magnet structure involves directly gluing the magnets to the rotor laminations and then adding a protective magnetic ring. Again, the added protective ring results in a relatively large air gap, leading to low air gap magnetic flux density and power density. Furthermore, because of the air gap between the magnets and the silicon steel sheets, vibrations occur between them during high-speed rotor rotation, further increasing the air gap. Ultimately, this leads to increasingly poor rotor stability during rotation, with increasingly intense vibrations between the magnets and the silicon steel sheets, eventually causing rotor structural damage and motor failure.

[0004] As disclosed in patent CN108880031A, the "Rotor Structure, Motor Rotor and Motor" patent shows, the structure of the iron core in this patent clearly limits the width and height that the magnetic tiles can be installed, affecting the magnetic field strength that the magnetic tiles can provide. Furthermore, the installation of the iron core and magnetic tiles is not sufficiently sealed, resulting in a large air gap. Therefore, the high-speed performance of the brushless motor in this patent is poor, and the energy loss is significant. Utility Model Content

[0005] The purpose of this invention is to provide a slotted silicon steel sheet structure that fits into and is securely fixed to the magnet of a motor rotor through an enveloping mechanism. Another purpose of this invention is to create slots in the silicon steel sheet, thereby increasing the enveloping contact area between the silicon steel sheet and the magnet, resulting in a larger and more secure connection between the enveloping structure and the silicon steel sheet, leading to greater stability and reliability during high-speed rotor rotation. Another purpose of this invention is to ensure a small electrical air gap, high magnetic density, high power density, and high motor efficiency. A further purpose of this invention is to eliminate the air gap between the magnet and the silicon steel sheet during installation, allowing them to maintain a unified structure during rotation and eliminating vibration between them.

[0006] This utility model achieves the above-mentioned technical objectives through the following technical means.

[0007] A silicon steel sheet structure includes magnetic tile mating points and magnetic tile bonding sections. At least four magnetic tile mating points are provided on the arc surface of the silicon steel sheet, with adjacent mating points spaced by the same arc. A groove is provided at the root of each magnetic tile mating point. The arc surface of the silicon steel sheet serves as the magnetic tile bonding section. The number of magnetic tile mating points can be an even number, such as six or eight. If the number is not even, the magnetic field strength distribution will be uneven, affecting rotor performance. If there are only two mating points, the connection between the magnetic tile and the silicon steel sheet will be unreliable, also affecting rotor performance.

[0008] Furthermore, the magnetic tile mating area has an inverted conical structure, and the upper end of the magnetic tile mating area is provided with a dovetail groove.

[0009] Furthermore, dovetail grooves are provided on both sides of the root of the magnetic tile mating area.

[0010] The magnetic tile bonding section is provided with several bonding section dovetail grooves.

[0011] Preferably, the magnetic tile mating area has semi-circular grooves on both sides of the root.

[0012] The magnetic tile bonding section is provided with several bonding section semi-circular grooves.

[0013] Preferably, the sidewall of the magnetic tile mating area is symmetrically provided with mating area sidewall grooves, the mating area sidewall grooves are semi-circular structures, the magnetic tile bonding section and the upper side of the magnetic tile mating area are both smooth arc segments, and the root of the magnetic tile mating area is provided with a root groove.

[0014] Furthermore, the angle of the root of the magnetic tile mating point covering the silicon steel sheet is in the range of 10° to 15°.

[0015] Preferably, the included angle of the sides at the mating point of the magnetic tile is in the range of 115° to 120°.

[0016] Preferably, the angle covered by the upper arc segment at the magnetic tile mating point is in the range of 20° to 25°.

[0017] A high-speed motor rotor includes a silicon steel sheet structure, with magnetic tiles fitted together at adjacent magnetic tile mating points. An envelope is provided above the magnetic tile mating points and on both sides of the magnetic tiles. The connection between the envelope and the magnetic tiles on both sides is an envelope wing surface with gradually varying thickness. The assembly height of the magnetic tiles is greater than the height of the magnetic tile mating points.

[0018] Furthermore, a portion of the structure is shaved off from the upper surfaces on both sides of the magnetic tile, resulting in an arc-shaped surface. The angle between the tangent of the shaved surface and the tangent of the arc-shaped portion of the unshaved magnetic tile is θ, with θ ranging from 3° to 5°.

[0019] The height at which the magnetic tile is installed on the silicon steel sheet is greater than the height of the mating point of the magnetic tile, and the angle at which the envelope body envelops the silicon steel sheet is ω, with the angle ω ranging from 35° to 45°.

[0020] This invention has the following benefits:

[0021] Compared to the iron core limitation of comparative technologies that restricts the installation volume of the magnetic tile, the silicon steel sheet of this invention can be fitted with a material taller than the joint height of the magnetic tile, resulting in a stronger magnetic field and higher magnetic density. Furthermore, the envelopment of the magnetic tile eliminates air gaps, preventing vibration between the magnetic tile and the silicon steel sheet. This results in high magnetic density, high power, and high overall strength, ensuring good operation even at high speeds. Moreover, the higher the motor speed, the more material is saved in manufacturing, leading to lower costs and facilitating large-scale motor production. The silicon steel sheet of this invention is particularly suitable for the rotor of high-speed motors. Attached Figure Description

[0022] Figure 1 This is a front view of the first embodiment of the present invention.

[0023] Figure 2 This is a front view of the second embodiment of the present invention.

[0024] Figure 3 This is a front view of the third embodiment of the present invention.

[0025] Figure 4 This is a front view of the magnetic tile and silicon steel sheet after they are secured by the envelope in this utility model.

[0026] In the figure, 1-magnetic tile mating area, 11-dovetail groove at mating area, 12-groove on the side wall of mating area, 2-magnetic tile bonding section, 21-dovetail groove of bonding section, 22-semi-circular groove at the root, 23-dovetail groove at the root, 24-semi-circular groove of bonding section, 25-groove at the root, 3-envelope body, 31-envelope wing surface, 4-magnetic tile. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0028] Example 1:

[0029] like Figure 1 As shown, a grooved silicon steel sheet structure includes a magnetic tile mating area 1 and a magnetic tile bonding section 2 disposed on the silicon steel sheet. The magnetic tile mating area 1 is located on the outer side of the silicon steel sheet. At least four magnetic tile mating areas 1 with the same shape and structure are disposed on the silicon steel sheet. The arc spacing between two adjacent magnetic tile mating areas 1 is the same. Between two adjacent magnetic tile mating areas 1, there is the magnetic tile bonding section 2 on the silicon steel sheet.

[0030] The grooved silicon steel sheet structure mainly consists of magnetic tile mating points 1 and magnetic tile bonding sections 2 on the silicon steel sheet. The magnetic tile mating points 1 are located on the surface of the silicon steel sheet and are used to mate with the magnetic tiles 4, preparing for subsequent envelopment work. There are at least four such magnetic tile mating points 1 on the silicon steel sheet, so the included angle between the center lines of adjacent magnetic tile mating points 1 does not exceed 90°.

[0031] Furthermore, the spacing arc between adjacent magnetic tile mating points 1 remains consistent, ensuring the overall structural symmetry and rationality of the silicon steel sheet. This ensures the overall dynamic balance performance of the rotor after the silicon steel sheet and magnetic tile 4 are enveloped and installed, maintaining good dynamic balance even at high speeds. The adjacent magnetic tile mating points 1 form a magnetic tile bonding section 2, which directly adheres to the lower end face of the magnetic tile 4, allowing for better contact and a more effective fit. This results in a better overall enveloping effect between the silicon steel sheet and the magnetic tile 4. The envelopment in this invention is achieved through injection molding, and the material constituting the enveloping body 3 is an injection molding material or a single-component or multi-component liquid-solid adhesive.

[0032] The magnetic tile mating joint 1 has an inverted conical structure, and its upper end is provided with at least two dovetail grooves 11, which are conical grooves on the magnetic tile mating joint 1. The inverted conical structure design of the magnetic tile mating joint 1 helps the magnetic tile 4 to be more securely embedded in the silicon steel sheet. This design allows the magnetic tile mating joint 1 to exert downward pressure on the magnetic tile 4 when mating with it, and at the same time, to provide sufficient centripetal force to the magnetic tile 4 when the rotor rotates at high speed, preventing the magnetic tile 4 from flying out of the silicon steel sheet and causing damage to the rotor or even the motor.

[0033] At the upper end of the magnetic tile mating joint 1, a plurality of dovetail grooves 11 are provided. The dovetail grooves 11 are conical grooves, allowing the enveloping adhesive material to enter the dovetail grooves 11 when the silicon steel sheet and the magnetic tile 4 are encased together, ensuring the enveloping structure fully fills the dovetail grooves 11. This increases the connection strength and reliability between the enveloping structure and the silicon steel sheet, enabling the enveloping mating joint 1 to firmly press the magnetic tile 4, and providing sufficient centripetal force to the magnetic tile 4 during high-speed rotor rotation.

[0034] The magnetic tile mating part 1 has root dovetail grooves 23 on both sides of its root, which are similar in shape to the dovetail grooves 11 of the mating part.

[0035] The dovetail groove 21 of the bonding section is provided on the magnetic tile bonding section 2, and a plurality of the dovetail grooves 21 are provided on the same section of the magnetic tile bonding section 2. The dovetail groove 21 of the bonding section can further increase the contact area between the envelope portion and the silicon steel sheet, improve the connection strength, and enhance the performance of the rotor.

[0036] The root of the magnetic tile mating point 1 covers the silicon steel sheet at an angle γ, with the angle γ ranging from 10° to 15°. In this embodiment, γ is specifically 10°. The angle γ limits the bottom arc length of the magnetic tile 4. Therefore, the smaller the angle γ, theoretically, the wider the magnetic tile 4 can be accommodated. The larger γ is, the smaller the width of the magnetic tile 4 can be accommodated. The larger the volume of the magnetic tile 4 on the rotor, the stronger the magnetic field and the better the magnetic density, but the corresponding mass is also larger, requiring a greater centripetal force and higher strength requirements for the magnetic tile mating point 1.

[0037] However, the angle of γ affects the thickness of the root of the magnetic tile mating part 1. The smaller the angle of γ, the thinner the root of the magnetic tile mating part 1, the weaker the strength of the magnetic tile mating part 1, and the smaller the weight of the magnetic tile 4 that can be pressed down. Therefore, the angle of γ is neither better the larger it is nor better the smaller it is. The preferred range of the angle of γ is within 10° to 15°.

[0038] The included angle of the side of the magnetic tile mating point 1 is β, and the angle of β is in the range of 115° to 120°. In this embodiment, β is specifically 115°. The angle of β limits the waist width of the magnetic tile 4, that is, it limits the tilt angle and the upper arc length of the magnetic tile 4. Therefore, the smaller the angle of β, theoretically, the wider the magnetic tile 4 that can be accommodated, and the smaller the tilt angle of the side of the magnetic tile 4. The larger the angle of β, the smaller the width of the magnetic tile 4 that can be accommodated, and the larger the tilt angle of the side of the magnetic tile 4. The larger the width of the magnetic tile 4 and the smaller the tilt angle, the larger the volume on the rotor, the stronger the magnetic field and the better the magnetic density. However, the corresponding mass is larger, the centripetal force required is greater, and the strength requirement of the magnetic tile mating point 1 is higher.

[0039] However, the size of the angle β affects the lateral thickness of the magnetic tile mating part 1. The smaller the angle β, the thinner the lateral part of the magnetic tile mating part 1, the weaker the strength of the magnetic tile mating part 1, and the smaller the weight of the magnetic tile 4 that can be pressed down. Therefore, the angle β is neither better the larger it is nor better the smaller it is. The optimal range of the angle β is within 115° to 120°.

[0040] The upper arc segment of the magnetic tile mating point 1 covers an angle α, which is within the range of 20° to 25°. In this embodiment, α is specifically 20°. α and β together limit the height of the magnetic tile mating point 1. Since the rotor has high requirements for diameter, the corresponding motor has strict requirements for rotor size. If the rotor is too large, the motor will be difficult to drive; if it is too small, stability will be poor. Therefore, the height of the magnetic tile mating point 1 affects the rotor diameter. α, in conjunction with β, needs to limit the height of the magnetic tile mating point 1 within a reasonable range to ensure the rotor's speed and stability.

[0041] Example 2:

[0042] like Figure 2 As shown, a grooved silicon steel sheet structure includes a magnetic tile mating area 1 and a magnetic tile bonding section 2 disposed on the silicon steel sheet. The magnetic tile mating area 1 is located on the outer side of the silicon steel sheet. At least four magnetic tile mating areas 1 with the same shape and structure are disposed on the silicon steel sheet. The arc spacing between two adjacent magnetic tile mating areas 1 is the same. Between two adjacent magnetic tile mating areas 1, there is the magnetic tile bonding section 2 on the silicon steel sheet.

[0043] The grooved silicon steel sheet structure mainly consists of magnetic tile mating points 1 and magnetic tile bonding sections 2 on the silicon steel sheet. The magnetic tile mating points 1 are located on the surface of the silicon steel sheet and are used to mate with the magnetic tiles 4, preparing for subsequent envelopment work. There are at least four such magnetic tile mating points 1 on the silicon steel sheet, so the included angle between the center lines of adjacent magnetic tile mating points 1 does not exceed 90°.

[0044] Furthermore, the spacing arc between adjacent magnetic tile mating points 1 remains consistent, ensuring the overall structural symmetry and rationality of the silicon steel sheet. This guarantees the overall dynamic balance performance of the rotor after the silicon steel sheet and magnetic tile 4 are installed in an envelope configuration, maintaining good dynamic balance even at high speeds. The adjacent magnetic tile mating points 1 form a magnetic tile bonding section 2, which directly contacts the lower end face of the magnetic tile 4, allowing for better contact and a more effective fit. This results in a better overall envelope effect between the silicon steel sheet and the magnetic tile 4.

[0045] The magnetic tile mating joint 1 has an inverted conical structure, and its upper end is provided with at least two dovetail grooves 11, which are conical grooves on the magnetic tile mating joint 1. The inverted conical structure design of the magnetic tile mating joint 1 helps the magnetic tile 4 to be more securely embedded in the silicon steel sheet. This design allows the magnetic tile mating joint 1 to exert downward pressure on the magnetic tile 4 when mating with it, and at the same time, to provide sufficient centripetal force to the magnetic tile 4 when the rotor rotates at high speed, preventing the magnetic tile 4 from flying out of the silicon steel sheet and causing damage to the rotor or even the motor.

[0046] At the upper end of the magnetic tile mating joint 1, several dovetail grooves 11 are provided. These dovetail grooves 11 can be configured according to actual needs. The dovetail grooves 11 are conical grooves, allowing the enveloping adhesive material to enter the dovetail grooves 11 when the silicon steel sheet and the magnetic tile 4 are encased together, ensuring the enveloping structure fully fills the dovetail grooves 11. This increases the connection strength and reliability between the enveloping structure and the silicon steel sheet, enabling the enveloping mating joint 1 to firmly press the magnetic tile 4, and providing sufficient centripetal force to the magnetic tile 4 during high-speed rotor rotation.

[0047] The magnetic tile mating area 1 has semi-circular grooves 22 on both sides of its root. These semi-circular grooves 22 are semi-circular in shape. The semi-circular grooves 22 further increase the contact area between the envelope portion and the silicon steel sheet, improving the connection strength and enhancing rotor performance. Furthermore, the envelope 3 of this invention eliminates the gap between the silicon steel sheet and the magnetic tile 4, preventing vibration between them during rotor rotation. This prevents high-frequency contact between the silicon steel sheet and the magnetic tile 4, which could lead to fatigue and breakage of the silicon steel sheet.

[0048] A semi-circular groove 24 is provided on the magnetic tile bonding section 2. Several semi-circular grooves 24 are provided on the same section of the magnetic tile bonding section 2, and the number of semi-circular grooves 24 can be increased or decreased according to actual needs. The semi-circular groove 24 can further increase the contact area between the envelope portion and the silicon steel sheet, improving the connection strength and enhancing the rotor's performance.

[0049] The root of the magnetic tile mating point 1 covers the silicon steel sheet at an angle γ, with the angle γ ranging from 10° to 15°. In this embodiment, γ is specifically 15°. The angle γ limits the bottom arc length of the magnetic tile 4. Therefore, the smaller the angle γ, theoretically, the wider the magnetic tile 4 can be accommodated. The larger γ is, the smaller the width of the magnetic tile 4 can be accommodated. The larger the volume of the magnetic tile 4 on the rotor, the stronger the magnetic field and the better the magnetic density, but the corresponding mass is also larger, requiring a greater centripetal force and higher strength requirements for the magnetic tile mating point 1.

[0050] However, the angle of γ affects the thickness of the root of the magnetic tile mating part 1. The smaller the angle of γ, the thinner the root of the magnetic tile mating part 1, the weaker the strength of the magnetic tile mating part 1, and the smaller the weight of the magnetic tile 4 that can be pressed down. Therefore, the angle of γ is neither better the larger it is nor better the smaller it is. The preferred range of the angle of γ is within 10° to 15°.

[0051] The included angle of the side of the magnetic tile mating point 1 is β, and the angle of β is in the range of 115° to 120°. In this embodiment, β is specifically 120°. The angle of β limits the waist width of the magnetic tile 4, that is, it limits the tilt angle and the upper arc length of the magnetic tile 4. Therefore, the smaller the angle of β, theoretically, the wider the magnetic tile 4 that can be accommodated, and the smaller the tilt angle of the side of the magnetic tile 4. The larger the β, the smaller the width of the magnetic tile 4 that can be accommodated, and the larger the tilt angle of the side of the magnetic tile 4. The larger the width of the magnetic tile 4 and the smaller the tilt angle, the larger the volume on the rotor, the stronger the magnetic field and the better the magnetic density. However, the corresponding mass is larger, the centripetal force required is greater, and the strength requirement of the magnetic tile mating point 1 is higher.

[0052] However, the size of the angle β affects the lateral thickness of the magnetic tile mating part 1. The smaller the angle β, the thinner the lateral part of the magnetic tile mating part 1, the weaker the strength of the magnetic tile mating part 1, and the smaller the weight of the magnetic tile 4 that can be pressed down. Therefore, the angle β is neither better the larger it is nor better the smaller it is. The optimal range of the angle β is within 115° to 120°.

[0053] The upper arc segment of the magnetic tile mating point 1 covers an angle α, which is within the range of 20° to 25°. In this embodiment, α is specifically 25°. α and β together limit the height of the magnetic tile mating point 1. Since the rotor has high requirements for diameter, the corresponding motor has strict requirements for rotor size. If the rotor is too large, the motor will be difficult to drive; if it is too small, stability will be poor. Therefore, the height of the magnetic tile mating point 1 affects the rotor diameter. α, in conjunction with β, needs to limit the height of the magnetic tile mating point 1 within a reasonable range to ensure the rotor's speed and stability.

[0054] Example 3:

[0055] like Figure 3 As shown, a grooved silicon steel sheet structure includes a magnetic tile mating area 1 and a magnetic tile bonding section 2 disposed on the silicon steel sheet. The magnetic tile mating area 1 is located on the outer side of the silicon steel sheet. At least four magnetic tile mating areas 1 with the same shape and structure are disposed on the silicon steel sheet. The arc spacing between two adjacent magnetic tile mating areas 1 is the same. Between two adjacent magnetic tile mating areas 1, there is the magnetic tile bonding section 2 on the silicon steel sheet.

[0056] The grooved silicon steel sheet structure mainly consists of magnetic tile mating points 1 and magnetic tile bonding sections 2 on the silicon steel sheet. The magnetic tile mating points 1 are located on the surface of the silicon steel sheet and are used to mate with the magnetic tiles 4, preparing for subsequent envelopment work. There are at least four such magnetic tile mating points 1 on the silicon steel sheet, so the included angle between the center lines of adjacent magnetic tile mating points 1 does not exceed 90°.

[0057] Furthermore, the spacing arc between adjacent magnetic tile mating points 1 remains consistent, ensuring the overall structural symmetry and rationality of the silicon steel sheet. This guarantees the overall dynamic balance performance of the rotor after the silicon steel sheet and magnetic tile 4 are enveloped and installed, maintaining good dynamic balance even at high speeds. Adjacent magnetic tile mating points 1 form magnetic tile bonding sections 2, which directly adhere to the lower end face of the magnetic tile 4, allowing for better contact and a more effective fit. This results in a better overall envelopment effect between the silicon steel sheet and the magnetic tile 4. The magnetic tile mating point 1 has an inverted conical structure.

[0058] Root grooves 25 are provided on both sides of the root portion of the magnetic tile mating area 1. These root grooves 25 are not embedded inside the silicon steel sheet. The root grooves 25 further increase the contact area between the envelope portion and the silicon steel sheet, improving the connection strength and enhancing the rotor's performance.

[0059] The sidewall of the magnetic tile mating area 1 is symmetrically provided with mating area sidewall slots 12, which are semi-circular structures. The magnetic tile bonding section 2 is a smooth arc segment, and the upper side of the magnetic tile mating area 1 is a smooth arc segment. No slots are made on the magnetic tile mating area 1 and the magnetic tile bonding section 2, thus protecting the structural integrity of the silicon steel sheet, although the enveloping contact area is not as large as in Embodiments 1 and 2. However, in this embodiment, the air gap between the silicon steel sheet and the magnetic tile 4 is small, the magnetic density is high, and the magnetic field performance is slightly better than in Embodiments 1 and 2.

[0060] The root of the magnetic tile mating point 1 covers the silicon steel sheet at an angle γ, with the angle γ ranging from 10° to 15°. In this embodiment, γ is specifically 12°. The angle γ limits the bottom arc length of the magnetic tile 4. Therefore, the smaller the angle γ, theoretically, the wider the magnetic tile 4 can be accommodated. The larger γ is, the smaller the width of the magnetic tile 4 can be accommodated. The larger the volume of the magnetic tile 4 on the rotor, the stronger the magnetic field and the better the magnetic density, but the corresponding mass is also larger, requiring a greater centripetal force and higher strength requirements for the magnetic tile mating point 1.

[0061] However, the angle of γ affects the thickness of the root of the magnetic tile mating part 1. The smaller the angle of γ, the thinner the root of the magnetic tile mating part 1, the weaker the strength of the magnetic tile mating part 1, and the smaller the weight of the magnetic tile 4 that can be pressed down. Therefore, the angle of γ is neither better the larger it is nor better the smaller it is. The preferred range of the angle of γ is within 10° to 15°.

[0062] The included angle of the side of the magnetic tile mating point 1 is β, and the angle of β is in the range of 115° to 120°. In this embodiment, β is specifically 123°. The angle of β limits the waist width of the magnetic tile 4, that is, it limits the tilt angle and the upper arc length of the magnetic tile 4. Therefore, the smaller the angle of β, theoretically, the wider the magnetic tile 4 that can be accommodated, and the smaller the tilt angle of the side of the magnetic tile 4. The larger the angle of β, the smaller the width of the magnetic tile 4 that can be accommodated, and the larger the tilt angle of the side of the magnetic tile 4. The larger the width of the magnetic tile 4 and the smaller the tilt angle, the larger the volume on the rotor, the stronger the magnetic field and the better the magnetic density. However, the corresponding mass is larger, the centripetal force required is greater, and the strength requirement of the magnetic tile mating point 1 is higher.

[0063] However, the size of the angle β affects the lateral thickness of the magnetic tile mating part 1. The smaller the angle β, the thinner the lateral part of the magnetic tile mating part 1, the weaker the strength of the magnetic tile mating part 1, and the smaller the weight of the magnetic tile 4 that can be pressed down. Therefore, the angle β is neither better the larger it is nor better the smaller it is. The optimal range of the angle β is within 115° to 120°.

[0064] The upper arc segment of the magnetic tile mating point 1 covers an angle α, which is within the range of 20° to 25°. In this embodiment, α is specifically 23°. α and β together limit the height of the magnetic tile mating point 1. Since the rotor has high requirements for diameter, the corresponding motor has strict requirements for rotor size. If the rotor is too large, the motor will be difficult to drive; if it is too small, stability will be poor. Therefore, the height of the magnetic tile mating point 1 affects the rotor diameter. α, in conjunction with β, needs to limit the height of the magnetic tile mating point 1 within a reasonable range to ensure the rotor's speed and stability.

[0065] Example 4:

[0066] This embodiment describes a high-speed motor rotor made of silicon steel sheets as described in Embodiments 1 to 3.

[0067] A high-speed motor rotor includes a silicon steel sheet structure. Magnets 4 are fitted together at adjacent magnet mating points 1. Envelope bodies 3 are provided above the magnet mating points 1 and on both sides of the magnets 4. The connection between the envelope body 3 and the magnets 4 on both sides is an envelope wing surface 31 with a gradually changing thickness. The assembly height of the magnets 4 is greater than the height of the magnet mating points 1. Only when the height of the magnets 4 is greater than the height of the magnet mating points 1 can the envelope body 3 be firmly pressed against the magnets 4 and the magnet mating points 1.

[0068] The envelope 3 provides centripetal force to the magnet 4 during rotation, pressing the magnet 4 onto the silicon steel sheet. On the other hand, it eliminates the assembly gap between the magnet 4 and the silicon steel sheet, allowing them to form an integrated structure. This prevents vibration between the magnet 4 and the silicon steel sheet when the motor rotor rotates, extending the service life of the high-speed motor rotor and improving the stability of the motor rotor during operation.

[0069] The upper surfaces of both sides of the magnetic tile 4 have a portion of their structure removed inwards, resulting in an arc-shaped surface. The angle between the tangent of this arc-shaped surface and the tangent of the unremoved arc portion of the magnetic tile 4 is θ, with θ ranging from 3° to 5°. The thickness of the envelope 3 should not be too large, as this would increase the overall volume and inertia of the rotor, which would be detrimental to its high-speed rotation.

[0070] The height of the magnetic tile 4 installed on the silicon steel sheet is greater than the height of the magnetic tile mating point 1, and the angle of the envelope 3 on the silicon steel sheet is ω, with the angle ω ranging from 35° to 45°.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A silicon steel sheet structure, characterized in that, It includes a magnetic tile mating area (1) and a magnetic tile bonding section (2). At least four magnetic tile mating areas (1) are provided on the arc surface of the silicon steel sheet. The interval between adjacent magnetic tile mating areas (1) is the same. A groove is provided at the root of the magnetic tile mating area (1). The arc surface of the silicon steel sheet is the magnetic tile bonding section (2).

2. The silicon steel sheet structure according to claim 1, characterized in that, The magnetic tile mating part (1) has an inverted conical structure, and the upper end of the magnetic tile mating part (1) is provided with a mating dovetail groove (11).

3. The silicon steel sheet structure according to claim 2, characterized in that, The magnetic tile mating part (1) has root dovetail grooves (23) on both sides of the root; The magnetic tile bonding section (2) is provided with several bonding section dovetail grooves (21).

4. The silicon steel sheet structure according to claim 2, characterized in that, The magnetic tile mating part (1) has a root semi-circular groove (22) on both sides of the root; The magnetic tile bonding section (2) is provided with several bonding section semicircular grooves (22).

5. The silicon steel sheet structure according to claim 1, characterized in that, The sidewall of the magnetic tile mating part (1) is symmetrically provided with mating part sidewall grooves (12), the mating part sidewall grooves (12) are semi-circular structures, the upper side of the magnetic tile bonding section (2) and the magnetic tile mating part (1) are both smooth arc segments, and the root of the magnetic tile mating part (1) is provided with a root groove (25).

6. The silicon steel sheet structure according to any one of claims 1 to 5, characterized in that, The root of the magnetic tile mating part (1) covers the silicon steel sheet at an angle between 10° and 15°.

7. The silicon steel sheet structure according to any one of claims 1 to 5, characterized in that, The included angle of the side of the magnetic tile mating point (1) is in the range of 115° to 120°.

8. The silicon steel sheet structure according to any one of claims 1 to 5, characterized in that, The angle covered by the upper arc segment of the magnetic tile mating part (1) is in the range of 20° to 25°.

9. A high-speed motor rotor, characterized in that, The structure includes the silicon steel sheet structure according to any one of claims 1 to 8, wherein magnetic tiles (4) are installed in the adjacent magnetic tile mating parts (1), and an envelope (3) is provided above the magnetic tile mating parts (1) and on both sides of the magnetic tiles (4). The connection between the envelope (3) and the magnetic tiles (4) on both sides is an envelope wing surface (31) with a gradually changing thickness. The assembly height of the magnetic tiles (4) is greater than the height of the magnetic tile mating parts (1).

10. The high-speed motor rotor according to claim 9, characterized in that, The upper surfaces on both sides of the magnetic tile (4) have a portion of the structure removed inwards. The surface after removal is an arc structure. The angle between the tangent of the arc structure and the tangent of the arc part of the magnetic tile (4) without removal is θ. The angle of θ is between 3° and 5°. The height of the magnetic tile (4) installed on the silicon steel sheet is greater than the height of the magnetic tile mating point (1), and the angle of the envelope (3) on the silicon steel sheet is ω, with the angle of ω ranging from 35° to 45°.

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